1/*
   2 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5 *
   6 * This software is available to you under a choice of one of two
   7 * licenses.  You may choose to be licensed under the terms of the GNU
   8 * General Public License (GPL) Version 2, available from the file
   9 * COPYING in the main directory of this source tree, or the
  10 * OpenIB.org BSD license below:
  11 *
  12 *     Redistribution and use in source and binary forms, with or
  13 *     without modification, are permitted provided that the following
  14 *     conditions are met:
  15 *
  16 *      - Redistributions of source code must retain the above
  17 *        copyright notice, this list of conditions and the following
  18 *        disclaimer.
  19 *
  20 *      - Redistributions in binary form must reproduce the above
  21 *        copyright notice, this list of conditions and the following
  22 *        disclaimer in the documentation and/or other materials
  23 *        provided with the distribution.
  24 *
  25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32 * SOFTWARE.
  33 */
  34
  35#include <linux/skbuff.h>
  36#include <linux/rtnetlink.h>
  37#include <linux/moduleparam.h>
  38#include <linux/ip.h>
  39#include <linux/in.h>
  40#include <linux/igmp.h>
  41#include <linux/inetdevice.h>
  42#include <linux/delay.h>
  43#include <linux/completion.h>
  44#include <linux/slab.h>
  45
  46#include <net/dst.h>
  47
  48#include "ipoib.h"
  49
  50#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  51static int mcast_debug_level;
  52
  53module_param(mcast_debug_level, int, 0644);
  54MODULE_PARM_DESC(mcast_debug_level,
  55		 "Enable multicast debug tracing if > 0");
  56#endif
  57
  58struct ipoib_mcast_iter {
  59	struct net_device *dev;
  60	union ib_gid       mgid;
  61	unsigned long      created;
  62	unsigned int       queuelen;
  63	unsigned int       complete;
  64	unsigned int       send_only;
  65};
  66
  67/* join state that allows creating mcg with sendonly member request */
  68#define SENDONLY_FULLMEMBER_JOIN	8
  69
  70/*
  71 * This should be called with the priv->lock held
  72 */
  73static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv,
  74					       struct ipoib_mcast *mcast,
  75					       bool delay)
  76{
  77	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
  78		return;
  79
  80	/*
  81	 * We will be scheduling *something*, so cancel whatever is
  82	 * currently scheduled first
  83	 */
  84	cancel_delayed_work(&priv->mcast_task);
  85	if (mcast && delay) {
  86		/*
  87		 * We had a failure and want to schedule a retry later
  88		 */
  89		mcast->backoff *= 2;
  90		if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
  91			mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
  92		mcast->delay_until = jiffies + (mcast->backoff * HZ);
  93		/*
  94		 * Mark this mcast for its delay, but restart the
  95		 * task immediately.  The join task will make sure to
  96		 * clear out all entries without delays, and then
  97		 * schedule itself to run again when the earliest
  98		 * delay expires
  99		 */
 100		queue_delayed_work(priv->wq, &priv->mcast_task, 0);
 101	} else if (delay) {
 102		/*
 103		 * Special case of retrying after a failure to
 104		 * allocate the broadcast multicast group, wait
 105		 * 1 second and try again
 106		 */
 107		queue_delayed_work(priv->wq, &priv->mcast_task, HZ);
 108	} else
 109		queue_delayed_work(priv->wq, &priv->mcast_task, 0);
 110}
 111
 112static void ipoib_mcast_free(struct ipoib_mcast *mcast)
 113{
 114	struct net_device *dev = mcast->dev;
 115	int tx_dropped = 0;
 116
 117	ipoib_dbg_mcast(ipoib_priv(dev), "deleting multicast group %pI6\n",
 118			mcast->mcmember.mgid.raw);
 119
 120	/* remove all neigh connected to this mcast */
 121	ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);
 122
 123	if (mcast->ah)
 124		ipoib_put_ah(mcast->ah);
 125
 126	while (!skb_queue_empty(&mcast->pkt_queue)) {
 127		++tx_dropped;
 128		dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 129	}
 130
 131	netif_tx_lock_bh(dev);
 132	dev->stats.tx_dropped += tx_dropped;
 133	netif_tx_unlock_bh(dev);
 134
 135	kfree(mcast);
 136}
 137
 138static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev)
 139{
 140	struct ipoib_mcast *mcast;
 141
 142	mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC);
 143	if (!mcast)
 144		return NULL;
 145
 146	mcast->dev = dev;
 147	mcast->created = jiffies;
 148	mcast->delay_until = jiffies;
 149	mcast->backoff = 1;
 150
 151	INIT_LIST_HEAD(&mcast->list);
 152	INIT_LIST_HEAD(&mcast->neigh_list);
 153	skb_queue_head_init(&mcast->pkt_queue);
 154
 155	return mcast;
 156}
 157
 158static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 159{
 160	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 161	struct rb_node *n = priv->multicast_tree.rb_node;
 162
 163	while (n) {
 164		struct ipoib_mcast *mcast;
 165		int ret;
 166
 167		mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 168
 169		ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 170			     sizeof (union ib_gid));
 171		if (ret < 0)
 172			n = n->rb_left;
 173		else if (ret > 0)
 174			n = n->rb_right;
 175		else
 176			return mcast;
 177	}
 178
 179	return NULL;
 180}
 181
 182static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 183{
 184	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 185	struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 186
 187	while (*n) {
 188		struct ipoib_mcast *tmcast;
 189		int ret;
 190
 191		pn = *n;
 192		tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 193
 194		ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 195			     sizeof (union ib_gid));
 196		if (ret < 0)
 197			n = &pn->rb_left;
 198		else if (ret > 0)
 199			n = &pn->rb_right;
 200		else
 201			return -EEXIST;
 202	}
 203
 204	rb_link_node(&mcast->rb_node, pn, n);
 205	rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 206
 207	return 0;
 208}
 209
 210static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 211				   struct ib_sa_mcmember_rec *mcmember)
 212{
 213	struct net_device *dev = mcast->dev;
 214	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 215	struct rdma_netdev *rn = netdev_priv(dev);
 216	struct ipoib_ah *ah;
 217	struct rdma_ah_attr av;
 218	int ret;
 219	int set_qkey = 0;
 220	int mtu;
 221
 222	mcast->mcmember = *mcmember;
 223
 224	/* Set the multicast MTU and cached Q_Key before we attach if it's
 225	 * the broadcast group.
 226	 */
 227	if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 228		    sizeof (union ib_gid))) {
 229		spin_lock_irq(&priv->lock);
 230		if (!priv->broadcast) {
 231			spin_unlock_irq(&priv->lock);
 232			return -EAGAIN;
 233		}
 234		/*update priv member according to the new mcast*/
 235		priv->broadcast->mcmember.qkey = mcmember->qkey;
 236		priv->broadcast->mcmember.mtu = mcmember->mtu;
 237		priv->broadcast->mcmember.traffic_class = mcmember->traffic_class;
 238		priv->broadcast->mcmember.rate = mcmember->rate;
 239		priv->broadcast->mcmember.sl = mcmember->sl;
 240		priv->broadcast->mcmember.flow_label = mcmember->flow_label;
 241		priv->broadcast->mcmember.hop_limit = mcmember->hop_limit;
 242		/* assume if the admin and the mcast are the same both can be changed */
 243		mtu = rdma_mtu_enum_to_int(priv->ca,  priv->port,
 244					   priv->broadcast->mcmember.mtu);
 245		if (priv->mcast_mtu == priv->admin_mtu)
 246			priv->admin_mtu = IPOIB_UD_MTU(mtu);
 247		priv->mcast_mtu = IPOIB_UD_MTU(mtu);
 248		rn->mtu = priv->mcast_mtu;
 249
 250		priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 251		spin_unlock_irq(&priv->lock);
 252		priv->tx_wr.remote_qkey = priv->qkey;
 253		set_qkey = 1;
 254	}
 255
 256	if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 257		if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 258			ipoib_warn(priv, "multicast group %pI6 already attached\n",
 259				   mcast->mcmember.mgid.raw);
 260
 261			return 0;
 262		}
 263
 264		ret = rn->attach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
 265				       be16_to_cpu(mcast->mcmember.mlid),
 266				       set_qkey, priv->qkey);
 267		if (ret < 0) {
 268			ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
 269				   mcast->mcmember.mgid.raw);
 270
 271			clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 272			return ret;
 273		}
 274	}
 275
 276	memset(&av, 0, sizeof(av));
 277	av.type = rdma_ah_find_type(priv->ca, priv->port);
 278	rdma_ah_set_dlid(&av, be16_to_cpu(mcast->mcmember.mlid));
 279	rdma_ah_set_port_num(&av, priv->port);
 280	rdma_ah_set_sl(&av, mcast->mcmember.sl);
 281	rdma_ah_set_static_rate(&av, mcast->mcmember.rate);
 282
 283	rdma_ah_set_grh(&av, &mcast->mcmember.mgid,
 284			be32_to_cpu(mcast->mcmember.flow_label),
 285			0, mcast->mcmember.hop_limit,
 286			mcast->mcmember.traffic_class);
 287
 288	ah = ipoib_create_ah(dev, priv->pd, &av);
 289	if (IS_ERR(ah)) {
 290		ipoib_warn(priv, "ib_address_create failed %ld\n",
 291			   -PTR_ERR(ah));
 292		/* use original error */
 293		return PTR_ERR(ah);
 294	}
 295	spin_lock_irq(&priv->lock);
 296	mcast->ah = ah;
 297	spin_unlock_irq(&priv->lock);
 298
 299	ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
 300			mcast->mcmember.mgid.raw,
 301			mcast->ah->ah,
 302			be16_to_cpu(mcast->mcmember.mlid),
 303			mcast->mcmember.sl);
 304
 305	/* actually send any queued packets */
 306	netif_tx_lock_bh(dev);
 307	while (!skb_queue_empty(&mcast->pkt_queue)) {
 308		struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 309
 310		netif_tx_unlock_bh(dev);
 311
 312		skb->dev = dev;
 313
 314		ret = dev_queue_xmit(skb);
 315		if (ret)
 316			ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
 317				   __func__, ret);
 318		netif_tx_lock_bh(dev);
 319	}
 320	netif_tx_unlock_bh(dev);
 321
 322	return 0;
 323}
 324
 325void ipoib_mcast_carrier_on_task(struct work_struct *work)
 326{
 327	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 328						   carrier_on_task);
 329	struct ib_port_attr attr;
 330
 331	if (ib_query_port(priv->ca, priv->port, &attr) ||
 332	    attr.state != IB_PORT_ACTIVE) {
 333		ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
 334		return;
 335	}
 336	/*
 337	 * Take rtnl_lock to avoid racing with ipoib_stop() and
 338	 * turning the carrier back on while a device is being
 339	 * removed.  However, ipoib_stop() will attempt to flush
 340	 * the workqueue while holding the rtnl lock, so loop
 341	 * on trylock until either we get the lock or we see
 342	 * FLAG_OPER_UP go away as that signals that we are bailing
 343	 * and can safely ignore the carrier on work.
 344	 */
 345	while (!rtnl_trylock()) {
 346		if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 347			return;
 348		else
 349			msleep(20);
 350	}
 351	if (!ipoib_cm_admin_enabled(priv->dev))
 352		dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
 353	netif_carrier_on(priv->dev);
 354	rtnl_unlock();
 355}
 356
 357static int ipoib_mcast_join_complete(int status,
 358				     struct ib_sa_multicast *multicast)
 359{
 360	struct ipoib_mcast *mcast = multicast->context;
 361	struct net_device *dev = mcast->dev;
 362	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 363
 364	ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
 365			test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
 366			"sendonly " : "",
 367			mcast->mcmember.mgid.raw, status);
 368
 369	/* We trap for port events ourselves. */
 370	if (status == -ENETRESET) {
 371		status = 0;
 372		goto out;
 373	}
 374
 375	if (!status)
 376		status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 377
 378	if (!status) {
 379		mcast->backoff = 1;
 380		mcast->delay_until = jiffies;
 381
 382		/*
 383		 * Defer carrier on work to priv->wq to avoid a
 384		 * deadlock on rtnl_lock here.  Requeue our multicast
 385		 * work too, which will end up happening right after
 386		 * our carrier on task work and will allow us to
 387		 * send out all of the non-broadcast joins
 388		 */
 389		if (mcast == priv->broadcast) {
 390			spin_lock_irq(&priv->lock);
 391			queue_work(priv->wq, &priv->carrier_on_task);
 392			__ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 393			goto out_locked;
 394		}
 395	} else {
 396		bool silent_fail =
 397		    test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
 398		    status == -EINVAL;
 399
 400		if (mcast->logcount < 20) {
 401			if (status == -ETIMEDOUT || status == -EAGAIN ||
 402			    silent_fail) {
 403				ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
 404						test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
 405						mcast->mcmember.mgid.raw, status);
 406			} else {
 407				ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
 408						test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
 409					   mcast->mcmember.mgid.raw, status);
 410			}
 411
 412			if (!silent_fail)
 413				mcast->logcount++;
 414		}
 415
 416		if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
 417		    mcast->backoff >= 2) {
 418			/*
 419			 * We only retry sendonly joins once before we drop
 420			 * the packet and quit trying to deal with the
 421			 * group.  However, we leave the group in the
 422			 * mcast list as an unjoined group.  If we want to
 423			 * try joining again, we simply queue up a packet
 424			 * and restart the join thread.  The empty queue
 425			 * is why the join thread ignores this group.
 426			 */
 427			mcast->backoff = 1;
 428			netif_tx_lock_bh(dev);
 429			while (!skb_queue_empty(&mcast->pkt_queue)) {
 430				++dev->stats.tx_dropped;
 431				dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 432			}
 433			netif_tx_unlock_bh(dev);
 434		} else {
 435			spin_lock_irq(&priv->lock);
 436			/* Requeue this join task with a backoff delay */
 437			__ipoib_mcast_schedule_join_thread(priv, mcast, 1);
 438			goto out_locked;
 439		}
 440	}
 441out:
 442	spin_lock_irq(&priv->lock);
 443out_locked:
 444	/*
 445	 * Make sure to set mcast->mc before we clear the busy flag to avoid
 446	 * racing with code that checks for BUSY before checking mcast->mc
 447	 */
 448	if (status)
 449		mcast->mc = NULL;
 450	else
 451		mcast->mc = multicast;
 452	clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 453	spin_unlock_irq(&priv->lock);
 454	complete(&mcast->done);
 455
 456	return status;
 457}
 458
 459/*
 460 * Caller must hold 'priv->lock'
 461 */
 462static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
 463{
 464	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 465	struct ib_sa_multicast *multicast;
 466	struct ib_sa_mcmember_rec rec = {
 467		.join_state = 1
 468	};
 469	ib_sa_comp_mask comp_mask;
 470	int ret = 0;
 471
 472	if (!priv->broadcast ||
 473	    !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 474		return -EINVAL;
 475
 476	init_completion(&mcast->done);
 477	set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 478
 479	ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 480
 481	rec.mgid     = mcast->mcmember.mgid;
 482	rec.port_gid = priv->local_gid;
 483	rec.pkey     = cpu_to_be16(priv->pkey);
 484
 485	comp_mask =
 486		IB_SA_MCMEMBER_REC_MGID		|
 487		IB_SA_MCMEMBER_REC_PORT_GID	|
 488		IB_SA_MCMEMBER_REC_PKEY		|
 489		IB_SA_MCMEMBER_REC_JOIN_STATE;
 490
 491	if (mcast != priv->broadcast) {
 492		/*
 493		 * RFC 4391:
 494		 *  The MGID MUST use the same P_Key, Q_Key, SL, MTU,
 495		 *  and HopLimit as those used in the broadcast-GID.  The rest
 496		 *  of attributes SHOULD follow the values used in the
 497		 *  broadcast-GID as well.
 498		 */
 499		comp_mask |=
 500			IB_SA_MCMEMBER_REC_QKEY			|
 501			IB_SA_MCMEMBER_REC_MTU_SELECTOR		|
 502			IB_SA_MCMEMBER_REC_MTU			|
 503			IB_SA_MCMEMBER_REC_TRAFFIC_CLASS	|
 504			IB_SA_MCMEMBER_REC_RATE_SELECTOR	|
 505			IB_SA_MCMEMBER_REC_RATE			|
 506			IB_SA_MCMEMBER_REC_SL			|
 507			IB_SA_MCMEMBER_REC_FLOW_LABEL		|
 508			IB_SA_MCMEMBER_REC_HOP_LIMIT;
 509
 510		rec.qkey	  = priv->broadcast->mcmember.qkey;
 511		rec.mtu_selector  = IB_SA_EQ;
 512		rec.mtu		  = priv->broadcast->mcmember.mtu;
 513		rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 514		rec.rate_selector = IB_SA_EQ;
 515		rec.rate	  = priv->broadcast->mcmember.rate;
 516		rec.sl		  = priv->broadcast->mcmember.sl;
 517		rec.flow_label	  = priv->broadcast->mcmember.flow_label;
 518		rec.hop_limit	  = priv->broadcast->mcmember.hop_limit;
 519
 520		/*
 521		 * Send-only IB Multicast joins work at the core IB layer but
 522		 * require specific SM support.
 523		 * We can use such joins here only if the current SM supports that feature.
 524		 * However, if not, we emulate an Ethernet multicast send,
 525		 * which does not require a multicast subscription and will
 526		 * still send properly. The most appropriate thing to
 527		 * do is to create the group if it doesn't exist as that
 528		 * most closely emulates the behavior, from a user space
 529		 * application perspective, of Ethernet multicast operation.
 530		 */
 531		if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 532			rec.join_state = SENDONLY_FULLMEMBER_JOIN;
 533	}
 
 534
 535	multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 536					 &rec, comp_mask, GFP_ATOMIC,
 537					 ipoib_mcast_join_complete, mcast);
 
 538	if (IS_ERR(multicast)) {
 539		ret = PTR_ERR(multicast);
 540		ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 541		/* Requeue this join task with a backoff delay */
 542		__ipoib_mcast_schedule_join_thread(priv, mcast, 1);
 543		clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 
 544		complete(&mcast->done);
 545		return ret;
 546	}
 547	return 0;
 548}
 549
 550void ipoib_mcast_join_task(struct work_struct *work)
 551{
 552	struct ipoib_dev_priv *priv =
 553		container_of(work, struct ipoib_dev_priv, mcast_task.work);
 554	struct net_device *dev = priv->dev;
 555	struct ib_port_attr port_attr;
 556	unsigned long delay_until = 0;
 557	struct ipoib_mcast *mcast = NULL;
 558
 559	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 560		return;
 561
 562	if (ib_query_port(priv->ca, priv->port, &port_attr)) {
 563		ipoib_dbg(priv, "ib_query_port() failed\n");
 564		return;
 565	}
 566	if (port_attr.state != IB_PORT_ACTIVE) {
 567		ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
 568			  port_attr.state);
 569		return;
 570	}
 571	priv->local_lid = port_attr.lid;
 572	netif_addr_lock_bh(dev);
 573
 574	if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
 575		netif_addr_unlock_bh(dev);
 576		return;
 577	}
 578	netif_addr_unlock_bh(dev);
 579
 580	spin_lock_irq(&priv->lock);
 581	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 582		goto out;
 583
 584	if (!priv->broadcast) {
 585		struct ipoib_mcast *broadcast;
 586
 587		broadcast = ipoib_mcast_alloc(dev);
 588		if (!broadcast) {
 589			ipoib_warn(priv, "failed to allocate broadcast group\n");
 590			/*
 591			 * Restart us after a 1 second delay to retry
 592			 * creating our broadcast group and attaching to
 593			 * it.  Until this succeeds, this ipoib dev is
 594			 * completely stalled (multicast wise).
 595			 */
 596			__ipoib_mcast_schedule_join_thread(priv, NULL, 1);
 597			goto out;
 598		}
 599
 600		memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 601		       sizeof (union ib_gid));
 602		priv->broadcast = broadcast;
 603
 604		__ipoib_mcast_add(dev, priv->broadcast);
 605	}
 606
 607	if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 608		if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
 609		    !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
 610			mcast = priv->broadcast;
 611			if (mcast->backoff > 1 &&
 612			    time_before(jiffies, mcast->delay_until)) {
 613				delay_until = mcast->delay_until;
 614				mcast = NULL;
 615			}
 616		}
 617		goto out;
 618	}
 619
 620	/*
 621	 * We'll never get here until the broadcast group is both allocated
 622	 * and attached
 623	 */
 624	list_for_each_entry(mcast, &priv->multicast_list, list) {
 625		if (IS_ERR_OR_NULL(mcast->mc) &&
 626		    !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
 627		    (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
 628		     !skb_queue_empty(&mcast->pkt_queue))) {
 629			if (mcast->backoff == 1 ||
 630			    time_after_eq(jiffies, mcast->delay_until)) {
 631				/* Found the next unjoined group */
 632				if (ipoib_mcast_join(dev, mcast)) {
 633					spin_unlock_irq(&priv->lock);
 634					return;
 635				}
 636			} else if (!delay_until ||
 637				 time_before(mcast->delay_until, delay_until))
 638				delay_until = mcast->delay_until;
 639		}
 640	}
 641
 642	mcast = NULL;
 643	ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
 644
 645out:
 646	if (delay_until) {
 647		cancel_delayed_work(&priv->mcast_task);
 648		queue_delayed_work(priv->wq, &priv->mcast_task,
 649				   delay_until - jiffies);
 650	}
 651	if (mcast)
 652		ipoib_mcast_join(dev, mcast);
 653
 654	spin_unlock_irq(&priv->lock);
 655}
 656
 657void ipoib_mcast_start_thread(struct net_device *dev)
 658{
 659	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 660	unsigned long flags;
 661
 662	ipoib_dbg_mcast(priv, "starting multicast thread\n");
 663
 664	spin_lock_irqsave(&priv->lock, flags);
 665	__ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 666	spin_unlock_irqrestore(&priv->lock, flags);
 667}
 668
 669void ipoib_mcast_stop_thread(struct net_device *dev)
 670{
 671	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 672
 673	ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 674
 675	cancel_delayed_work_sync(&priv->mcast_task);
 676}
 677
 678static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 679{
 680	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 681	struct rdma_netdev *rn = netdev_priv(dev);
 682	int ret = 0;
 683
 684	if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 685		ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
 686
 687	if (!IS_ERR_OR_NULL(mcast->mc))
 688		ib_sa_free_multicast(mcast->mc);
 689
 690	if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 691		ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 692				mcast->mcmember.mgid.raw);
 693
 694		/* Remove ourselves from the multicast group */
 695		ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
 696				       be16_to_cpu(mcast->mcmember.mlid));
 697		if (ret)
 698			ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 699	} else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 700		ipoib_dbg(priv, "leaving with no mcmember but not a "
 701			  "SENDONLY join\n");
 702
 703	return 0;
 704}
 705
 706/*
 707 * Check if the multicast group is sendonly. If so remove it from the maps
 708 * and add to the remove list
 709 */
 710void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
 711				struct list_head *remove_list)
 712{
 713	/* Is this multicast ? */
 714	if (*mgid == 0xff) {
 715		struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid);
 716
 717		if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 718			list_del(&mcast->list);
 719			rb_erase(&mcast->rb_node, &priv->multicast_tree);
 720			list_add_tail(&mcast->list, remove_list);
 721		}
 722	}
 723}
 724
 725void ipoib_mcast_remove_list(struct list_head *remove_list)
 726{
 727	struct ipoib_mcast *mcast, *tmcast;
 728
 729	/*
 730	 * make sure the in-flight joins have finished before we attempt
 731	 * to leave
 732	 */
 733	list_for_each_entry_safe(mcast, tmcast, remove_list, list)
 734		if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 735			wait_for_completion(&mcast->done);
 736
 737	list_for_each_entry_safe(mcast, tmcast, remove_list, list) {
 738		ipoib_mcast_leave(mcast->dev, mcast);
 739		ipoib_mcast_free(mcast);
 740	}
 741}
 742
 743void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
 744{
 745	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 746	struct rdma_netdev *rn = netdev_priv(dev);
 747	struct ipoib_mcast *mcast;
 748	unsigned long flags;
 749	void *mgid = daddr + 4;
 750
 751	spin_lock_irqsave(&priv->lock, flags);
 752
 753	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)		||
 754	    !priv->broadcast					||
 755	    !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 756		++dev->stats.tx_dropped;
 757		dev_kfree_skb_any(skb);
 758		goto unlock;
 759	}
 760
 761	mcast = __ipoib_mcast_find(dev, mgid);
 762	if (!mcast || !mcast->ah) {
 763		if (!mcast) {
 764			/* Let's create a new send only group now */
 765			ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 766					mgid);
 767
 768			mcast = ipoib_mcast_alloc(dev);
 769			if (!mcast) {
 770				ipoib_warn(priv, "unable to allocate memory "
 771					   "for multicast structure\n");
 772				++dev->stats.tx_dropped;
 773				dev_kfree_skb_any(skb);
 774				goto unlock;
 775			}
 776
 777			set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 778			memcpy(mcast->mcmember.mgid.raw, mgid,
 779			       sizeof (union ib_gid));
 780			__ipoib_mcast_add(dev, mcast);
 781			list_add_tail(&mcast->list, &priv->multicast_list);
 782		}
 783		if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) {
 784			/* put pseudoheader back on for next time */
 785			skb_push(skb, sizeof(struct ipoib_pseudo_header));
 786			skb_queue_tail(&mcast->pkt_queue, skb);
 787		} else {
 788			++dev->stats.tx_dropped;
 789			dev_kfree_skb_any(skb);
 790		}
 791		if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 792			__ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 793		}
 794	} else {
 795		struct ipoib_neigh *neigh;
 796
 797		spin_unlock_irqrestore(&priv->lock, flags);
 798		neigh = ipoib_neigh_get(dev, daddr);
 799		spin_lock_irqsave(&priv->lock, flags);
 800		if (!neigh) {
 801			neigh = ipoib_neigh_alloc(daddr, dev);
 802			/* Make sure that the neigh will be added only
 803			 * once to mcast list.
 804			 */
 805			if (neigh && list_empty(&neigh->list)) {
 806				kref_get(&mcast->ah->ref);
 807				neigh->ah	= mcast->ah;
 808				neigh->ah->valid = 1;
 809				list_add_tail(&neigh->list, &mcast->neigh_list);
 810			}
 811		}
 812		spin_unlock_irqrestore(&priv->lock, flags);
 813		mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah,
 814						IB_MULTICAST_QPN);
 815		if (neigh)
 816			ipoib_neigh_put(neigh);
 817		return;
 818	}
 819
 820unlock:
 821	spin_unlock_irqrestore(&priv->lock, flags);
 822}
 823
 824void ipoib_mcast_dev_flush(struct net_device *dev)
 825{
 826	struct ipoib_dev_priv *priv = ipoib_priv(dev);
 827	LIST_HEAD(remove_list);
 828	struct ipoib_mcast *mcast, *tmcast;
 829	unsigned long flags;
 830
 831	mutex_lock(&priv->mcast_mutex);
 832	ipoib_dbg_mcast(priv, "flushing multicast list\n");
 833
 834	spin_lock_irqsave(&priv->lock, flags);
 835
 836	list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 837		list_del(&mcast->list);
 838		rb_erase(&mcast->rb_node, &priv->multicast_tree);
 839		list_add_tail(&mcast->list, &remove_list);
 840	}
 841
 842	if (priv->broadcast) {
 843		rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 844		list_add_tail(&priv->broadcast->list, &remove_list);
 845		priv->broadcast = NULL;
 846	}
 847
 848	spin_unlock_irqrestore(&priv->lock, flags);
 849
 850	ipoib_mcast_remove_list(&remove_list);
 851	mutex_unlock(&priv->mcast_mutex);
 852}
 853
 854static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
 855{
 856	/* reserved QPN, prefix, scope */
 857	if (memcmp(addr, broadcast, 6))
 858		return 0;
 859	/* signature lower, pkey */
 860	if (memcmp(addr + 7, broadcast + 7, 3))
 861		return 0;
 862	return 1;
 863}
 864
 865void ipoib_mcast_restart_task(struct work_struct *work)
 866{
 867	struct ipoib_dev_priv *priv =
 868		container_of(work, struct ipoib_dev_priv, restart_task);
 869	struct net_device *dev = priv->dev;
 870	struct netdev_hw_addr *ha;
 871	struct ipoib_mcast *mcast, *tmcast;
 872	LIST_HEAD(remove_list);
 873	struct ib_sa_mcmember_rec rec;
 874
 875	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 876		/*
 877		 * shortcut...on shutdown flush is called next, just
 878		 * let it do all the work
 879		 */
 880		return;
 881
 882	ipoib_dbg_mcast(priv, "restarting multicast task\n");
 883
 884	netif_addr_lock_bh(dev);
 885	spin_lock_irq(&priv->lock);
 886
 887	/*
 888	 * Unfortunately, the networking core only gives us a list of all of
 889	 * the multicast hardware addresses. We need to figure out which ones
 890	 * are new and which ones have been removed
 891	 */
 892
 893	/* Clear out the found flag */
 894	list_for_each_entry(mcast, &priv->multicast_list, list)
 895		clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 896
 897	/* Mark all of the entries that are found or don't exist */
 898	netdev_for_each_mc_addr(ha, dev) {
 899		union ib_gid mgid;
 900
 901		if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
 902			continue;
 903
 904		memcpy(mgid.raw, ha->addr + 4, sizeof(mgid));
 905
 906		mcast = __ipoib_mcast_find(dev, &mgid);
 907		if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 908			struct ipoib_mcast *nmcast;
 909
 910			/* ignore group which is directly joined by userspace */
 911			if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 912			    !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 913				ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 914						mgid.raw);
 915				continue;
 916			}
 917
 918			/* Not found or send-only group, let's add a new entry */
 919			ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 920					mgid.raw);
 921
 922			nmcast = ipoib_mcast_alloc(dev);
 923			if (!nmcast) {
 924				ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 925				continue;
 926			}
 927
 928			set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 929
 930			nmcast->mcmember.mgid = mgid;
 931
 932			if (mcast) {
 933				/* Destroy the send only entry */
 934				list_move_tail(&mcast->list, &remove_list);
 935
 936				rb_replace_node(&mcast->rb_node,
 937						&nmcast->rb_node,
 938						&priv->multicast_tree);
 939			} else
 940				__ipoib_mcast_add(dev, nmcast);
 941
 942			list_add_tail(&nmcast->list, &priv->multicast_list);
 943		}
 944
 945		if (mcast)
 946			set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 947	}
 948
 949	/* Remove all of the entries don't exist anymore */
 950	list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 951		if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 952		    !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 953			ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 954					mcast->mcmember.mgid.raw);
 955
 956			rb_erase(&mcast->rb_node, &priv->multicast_tree);
 957
 958			/* Move to the remove list */
 959			list_move_tail(&mcast->list, &remove_list);
 960		}
 961	}
 962
 963	spin_unlock_irq(&priv->lock);
 964	netif_addr_unlock_bh(dev);
 965
 966	ipoib_mcast_remove_list(&remove_list);
 967
 968	/*
 969	 * Double check that we are still up
 970	 */
 971	if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 972		spin_lock_irq(&priv->lock);
 973		__ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 974		spin_unlock_irq(&priv->lock);
 975	}
 976}
 977
 978#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 979
 980struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 981{
 982	struct ipoib_mcast_iter *iter;
 983
 984	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
 985	if (!iter)
 986		return NULL;
 987
 988	iter->dev = dev;
 989	memset(iter->mgid.raw, 0, 16);
 990
 991	if (ipoib_mcast_iter_next(iter)) {
 992		kfree(iter);
 993		return NULL;
 994	}
 995
 996	return iter;
 997}
 998
 999int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
1000{
1001	struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
1002	struct rb_node *n;
1003	struct ipoib_mcast *mcast;
1004	int ret = 1;
1005
1006	spin_lock_irq(&priv->lock);
1007
1008	n = rb_first(&priv->multicast_tree);
1009
1010	while (n) {
1011		mcast = rb_entry(n, struct ipoib_mcast, rb_node);
1012
1013		if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
1014			   sizeof (union ib_gid)) < 0) {
1015			iter->mgid      = mcast->mcmember.mgid;
1016			iter->created   = mcast->created;
1017			iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
1018			iter->complete  = !!mcast->ah;
1019			iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1020
1021			ret = 0;
1022
1023			break;
1024		}
1025
1026		n = rb_next(n);
1027	}
1028
1029	spin_unlock_irq(&priv->lock);
1030
1031	return ret;
1032}
1033
1034void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1035			   union ib_gid *mgid,
1036			   unsigned long *created,
1037			   unsigned int *queuelen,
1038			   unsigned int *complete,
1039			   unsigned int *send_only)
1040{
1041	*mgid      = iter->mgid;
1042	*created   = iter->created;
1043	*queuelen  = iter->queuelen;
1044	*complete  = iter->complete;
1045	*send_only = iter->send_only;
1046}
1047
1048#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */